Re-analysis of the braincase of Acanthodes bronni has revealed that this 290-million-year-old fossil fish resembled a shark. The fossilized braincase of Acanthodes bronni and artist’s impression of the ancient fish (Michael Coates / Nobu Tamura) The new study, published in Nature, sheds light on the evolution of the earliest jawed vertebrates and offers a new glimpse of the last common ancestor before the split between the earliest sharks and...
